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Volume 77 (2000 - 200･･･
- Issue 6 Pages 189-
- Issue 5 Pages 137-
- Issue 4 Pages 93-
- Issue 2-3 Pages 39-
- Issue 1 Pages 1-
Predecessor
Volume 77, Issue 1
Displaying 1-6 of 6 articles from this issue
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Hu YUAN, Noboru GOTO, Hiroshi AKITA, Naoki SHIRAISHI, Hui-Jing HE2000 Volume 77 Issue 1 Pages 1-4
Published: May 22, 2000
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSWe examined 12 human cervical spinal cords to study the numbers and transverse cell body areas of the motoneurons in relation to the aging process. Our conclusion was that cervical motoneurons regulate their function by increasing in size to compensate the loss in numbers that occur as people get older.View full abstractDownload PDF (824K) -
Toshihiro KONNO, Atsushi SUZUKI2000 Volume 77 Issue 1 Pages 5-10
Published: May 22, 2000
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe myofibers of the skeletal muscle vary in length in muscle and from muscle to muscle. Information about myofiber length and myofiber arrangement is necessary to understand the architecture of muscles and differences in myofiber length in muscles. The purpose of the present study was to determine myofiber lengths, ratio of myofiber length to muscle length, and myofiber arrangement of the antebrachial and leg muscles in the sheep. The myofibers of the antebrachial muscles ranged from 7.3 mm (m. extensor carpi ulneris, bipennate muscle) to 39.6 mm (m. flexor digitorum profundus caput radiale, unipennate muscle) in length. The myofibers of the leg muscles ranged from 10.0 mm (m. flexor digitorum superficialis, multipennate muscle) to 119.2 mm (m. soleus, fusiform muscle) in length. The ratio of myofiber length to muscle length in the fusiform muscle was higher than that in the uni-, bi-, and multipennate muscles.View full abstractDownload PDF (1353K) -
Marjan JAMALI, Daisuke HAYAKAWA, Huayue CHEN, Shoichi EMURA, Yuki OZAW ...2000 Volume 77 Issue 1 Pages 11-19
Published: May 22, 2000
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe ultrastructure of the parathyroid gland and the SEM appearances of the tibia were studied in hamsters with and without administration of caffeine. Caffeine was treated orally each day at either 23 mg (low dose) or 10 mg (high dose) per 100 g body weight for a period of 17 or 32 days. Statistical analysis showed no significant differences among all groups examined regarding the serum calcium level. Transmission electron microscopy of the parathyroid gland revealed that the volume densities occupied by the mitochondria, Golgi complexes and rough endoplasmic reticulum of caffeine-treated groups were found significantly higher when compared with controls. The number of secretory granules observed close to the cell membrane per total amount of these granules revealed significant increase in all caffeine-treated animals. The bone mineral content (BMC) values were closely related to body weight. In the high dose caffeine-treated hamsters increment of the mean BMC and body weight values was significantly lower than those of the controls after 32 days. In the scanning electron microscopic studies of the tibia, no alteration in the morphometric parameters was demonstrated.
It is considered that the synthesis and release of parathyroid hormone is stimulated following caffeine consumption. Our data suggest that although chronic administration of caffeine in the hamster may slightly increase bone turnover as evidenced by the BMC decrease, bone morphometry was not altered. Thus the osteoporotic changes were not proved in this study.View full abstractDownload PDF (2823K) -
Ming ZHOU, Noboru GOTO, Jun GOTO, Hiroshi MORIYAMA, Hui-Jing HE2000 Volume 77 Issue 1 Pages 21-27
Published: May 22, 2000
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSAxons in the lateral corticospinal tract (LCST) were analyzed morphometrically on 37 cadavers (24 males and 13 females). The results revealed gender differences at the first lumbar cord level Whereas the shape of the axons showed small differences (they were slightly more circular in males than in females), significant differences regarding the average area and diameter were found for the first time: these showed significant reduction with age in the case of males, but not in the case of females.View full abstractDownload PDF (2216K) -
Keiichi MORIGUCHI, Michiya UTSUMI, Hajime HANAMURA, Norikazu OHNO2000 Volume 77 Issue 1 Pages 29-33
Published: May 22, 2000
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSEndogenous peroxidase activity in the submandibular gland of the house musk shrew, Suncus murinus was cytochemically investigated by light and electron microscopy using 3,3'-diaminobenzidine-tetrahydrochloride salt (DAB). The submandibular glands of male Suncus murinus at 8-month-olds were excised and diced into small pieces. In general, salivary glands are structurally divided into a terminal portion comprising a secretory portion and duct system. The submandibular gland of the Suncus murinus, the terminal portions consisted of proximal and distal acinar cells. On the other hand, a granular duct cell of the duct system contained a number of characteristic myelin-like bodies. In the present study, the peroxidase reaction products were localized in the secretory granules of the proximal acinar cells and in the endoplasmic reticulum, Golgi apparatus and myelin-like bodies of the granular duct cells. These reaction products were reduced when 5 mM 3-amino-1,2,4-triazole was added to the reaction medium. Additionally, release of peroxidase into the lumen was observed. In conclusion, the proximal acinar and granular duct cells formed peroxidase and may have performed excretory secretions. Moreover, the peroxidase positive myelin-like body consisted of lamellated membrane and its outer surface membrane continued to the endoplasmic reticulum.View full abstractDownload PDF (1809K) -
Jun GOTO, Noboru GOTO2000 Volume 77 Issue 1 Pages 35-37
Published: May 22, 2000
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSSexual dimorphism was found regarding the cortico-medullary volume ratio in human brains throughout the age range, without the need for statistical analysis. After measurement of the areas of the whole pallium, cerebral cortex and cerebral medullary substance in 10 mm thick slices with the help of an image-analyzer, the total volume of the brain was calculated by integrating the volumes of each slice. The sexual dimorphism found in the cortico-medullary volume ratio may be of importance to understand sex differences, to solve questions related to various activities, functions, behaviours and responses, or to evaluate various pathologic conditions including non-physiological cerebral atrophy.View full abstractDownload PDF (651K)
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